How to Improve performance of PC
 

Hi

I am new to this world of linux. so i have some basic queries and i hope these will not be irritating for you.

1- I would like to know , how i can check what services are running on my system and how i can stop unnecessary services ? like in Task Manager of Windows

2- How can i find what RPMs i have installed on my system and their dependencies.

Thanking you in advance

1) To see the running processes "ps -ef" (see "man ps" for all options). To stop a process:
kill pid

2) To see all installed rpms "rpm -qa". To see what dependencies a package needs "rpm -qR packagename"

is there anyway 2 know that what services are unnecessary ?
i actually want 2 speed up my system by removing some of the services but i don't know what service i should close which will not harm my system.

Red Hat has it's own services manager (which distro do you have?) that you can use to configure the services. Search to find out what each one is ('man [service you saw]', Google).